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<?php |
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namespace Gwa\Image; |
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/** |
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* Calculates new image dimensions |
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*/ |
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class Dimensions |
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{ |
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/** |
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* @param int $maxwidth |
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* @param int $maxheight |
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* @return \stdClass |
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*/ |
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public function resizeToWithin($width, $height, $maxwidth, $maxheight) |
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{ |
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if ($width <= $maxwidth && $height <= $maxheight) { |
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return null; |
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} |
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// calculate ratio based on widths |
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$ratio = $maxwidth / $width; |
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if ($height * $ratio > $maxheight) { |
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// new height greater than maximum |
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$ratio = $maxheight / $height; |
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} |
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$dimensions = new \stdClass; |
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$dimensions->width = max(1, round($width * $ratio)); |
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$dimensions->height = max(1, round($height * $ratio)); |
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return $dimensions; |
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} |
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/** |
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* @param int $width |
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* @param int $height |
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* @param int|null $newwidth |
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* @param int|null $newheight |
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* @return \stdClass|null |
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*/ |
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public function resizeTo($width, $height, $newwidth, $newheight) |
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{ |
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if ($width === $newwidth && $height === $newheight) { |
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return null; |
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} |
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if (!$newheight) { |
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return $this->resizeToWidth($width, $height, $newwidth); |
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} |
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if (!$newwidth) { |
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return $this->resizeToHeight($width, $height, $newheight); |
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} |
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$ratio = $newwidth / $width; |
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$dimensions = new \stdClass; |
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$dimensions->overhang = false; |
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$dimensions->width = $newwidth; |
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$dimensions->height = $newheight; |
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if ($height * $ratio < $newheight) { |
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// - height is too small |
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// - resize to height, and crop horizontal overhang |
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$ratio = $newheight / $height; |
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$dimensions->width = max(1, round($width * $ratio)); |
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$dimensions->height = $newheight; |
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$dimensions->overhang = true; |
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} elseif ($height * $ratio > $newheight) { |
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// - height is too large |
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// - resize to width, and crop vertical overhang |
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$dimensions->width = $newwidth; |
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$dimensions->height = max(1, round($height * $ratio)); |
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$dimensions->overhang = true; |
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} |
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return $dimensions; |
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} |
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/** |
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* @param int $width |
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* @param int $height |
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* @param int $newwidth |
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* @return \stdClass|null |
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*/ |
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View Code Duplication |
private function resizeToWidth($width, $height, $newwidth) |
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{ |
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if ($width === $newwidth) { |
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return null; |
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} |
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$ratio = $newwidth / $width; |
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$dimensions = new \stdClass; |
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$dimensions->width = $newwidth; |
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$dimensions->height = max(1, round($height * $ratio)); |
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$dimensions->overhang = false; |
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return $dimensions; |
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} |
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/** |
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* @param int $width |
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* @param int $height |
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* @param int $newheight |
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* @return \stdClass |
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*/ |
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View Code Duplication |
private function resizeToHeight($width, $height, $newheight) |
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{ |
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if ($height === $newheight) { |
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return null; |
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} |
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$ratio = $newheight / $height; |
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$dimensions = new \stdClass; |
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$dimensions->width = max(1, round($width * $ratio)); |
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$dimensions->height = $newheight; |
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$dimensions->overhang = false; |
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return $dimensions; |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
integer
values, zero is a special case, in particular the following results might be unexpected: